Figure 8
From: Detection of tampered region for JPEG images by using mode-based first digit features
The probability distributions of OL and DE for JPEG + uncompressed manipulation: (a) The JPEG + uncompressed manipulation with the JPEG quality factors QF 1 = 55 and QF 2 = 85; (b) The JPEG + uncompressed manipulation with the JPEG quality factors QF 1 = 60 and QF 2 = 75. In each panel, the red dashed curve corresponds to the probability distribution of DE, and the blue solid curve denotes the probability distribution of OL. See also Tables2 and3.